Abstract: Based on the initial parameter method, this paper studies the deformation and stress distributions of elastic foundation framesubjected to uniform pressure and with two nodes simply supported.Firstly, the calculation formula for deflections of a finite-length elasticfoundation beam with elastic support at both ends is derived. Based on theboundary conditions and the symmetry of the structure, a local structure is considered without taking account of the displacement boundary conditionsat the two simply supported nodes. The initial parameter of the localstructure is obtained according to the boundary conditions of thedisplacement and the internal force, then, the distribution of stresses of thewhole structure is obtained based on the symmetry.The calculation formulas of the real deflection for the frame areobtained, modified by the foregoing displacement distribution according to thedisplacement boundary conditions.